Tamil Nadu Board 12th Standard Bio-Zoology - Chapter 12: Book Back Answers and Solutions
This post covers the book back answers and solutions for Chapter 12 – Bio-Zoology from the Tamil Nadu State Board 12th Standard Bio-Zoology textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Bio-Zoology Chapter 12 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 12 students! Prepare well and aim for top scores. Thank you!
Chapter 12: Environmental Issues
I. Multiple Choice Questions
a) Article 12
b) Article 21
c) Article 31
d) Article 41
Answer Key:
b) Article 21
2. The ‘thickness’ of Stratospheric Ozone layer is measured in/on:
a) Sieverts units
b) Dobson units
c) Melson units
d)Beaufort Scale
Answer Key:
b) Dobson units
3. As per 2017 statistics, the highest per capita emitter of Carbon dioxide in the world is
a) USA
b) China
c) Qatar
d) Saudi Arabia
Answer Key:
b) China
4. The use of microorganism metabolism to remove pollutants such as oil spills in the water bodies is known as
a) Biomagnification
b) Bioremediation
c) Biomethanation
d) Bioreduction
Answer Key:
b) Bioremediation
5. Which among the following always decreases in a Food chain across tropic levels?
a) Number
b)Accumulated chemicals
c) Energy
d) Force
Answer Key:
b)Accumulated chemicals
6. In the E-waste generated by the Mobile Phones, which among the following metal is most abundant?
a) Copper
b) Silver
c) Palladium
d) Gold
Answer Key:
a) Copper
7. ___________ is/are an ideal disinfectant for waste water.
a) U-V Rays
b) Chlorination
c) Boiling
d) Ozonisation
Answer Key:
a) U-V Rays
8. SMOG is derived from:
a) Smoke
b) Fog
c) Both A and B
d) Only A
Answer Key:
c) Both A and B
9. Excess of fluoride in drinking water causes:
a) Lung disease
b) Intestinal infection
c) Fluorosis
d) None of the above
Answer Key:
c) Fluorosis
II. Short answer questions
12th bio zoolgy III. Long answer questions
12th bio zology
0 Comments:
Post a Comment